Final answer:
The DNA sequence CATG would be connected to its complementary sequence GTAC by 10 hydrogen bonds in a double helix, with three bonds between each C and G and two between each A and T.
Step-by-step explanation:
The DNA sequence CATG would pair with its complementary sequence GTAC on the other strand in a double helix of DNA. In this pairing sequence, between cytosine (C) and guanine (G), there are three hydrogen bonds, and between adenine (A) and thymine (T), there are two hydrogen bonds. Therefore, we can calculate the number of hydrogen bonds in the sequence CATG and its complement by adding the number of bonds for each pair: C pairs with G with three bonds, A pairs with T with two bonds, T again pairs with A with two bonds, and G pairs with C with three bonds. In total, this gives us 3 + 2 + 2 + 3 = 10 hydrogen bonds holding the two strands together.